MLX90614 非接触式红外测温传感器 IR温度采集模块字写驱动代码（亲测可用）

/******************************************************************************* * 文件名 : mlx90614.c * 作 者 : * 版 本 : * 日 期 : 2013-08-07 * 描 述 : mlx90614函数 *******************************************************************************/ /* Includes ------------------------------------------------------------------*/ #include "mlx90614.h" #include "delay.h" /* Private macro -------------------------------------------------------------*/ /* Private variables ---------------------------------------------------------*/ //int main(void) //{ // float temp; // delay_init(); //延时函数初始化 // uart_init(115200); //串口初始化为115200 // IIC_Init(); // delay_ms(100); // while(1) // { // temp=SMBus_ReadTemp(); // printf("温度值：%.2f\r\n",temp); // delay_ms(1000); // } // //} /******************************************************************************* * Function Name : SMBus_StartBit * Description : Generate START condition on SMBus * Input : None * Output : None * Return : None *******************************************************************************/ void SMBus_StartBit(void) { SMBUS_IIC_SDA=1; // Set SDA line delay_us(5); // Wait a few microseconds SMBUS_IIC_SCL=1; // Set SCL line delay_us(5); // Generate bus free time between Stop SMBUS_IIC_SDA=0; // Clear SDA line delay_us(5); // Hold time after (Repeated) Start // Condition. After this period, the first clock is generated. //(Thd:sta=4.0us min) SMBUS_IIC_SCL=0; // Clear SCL line delay_us(5); // Wait a few microseconds } /******************************************************************************* * Function Name : SMBus_StopBit * Description : Generate STOP condition on SMBus * Input : None * Output : None * Return : None *******************************************************************************/ void SMBus_StopBit(void) { SMBUS_IIC_SCL=0; // Clear SCL line delay_us(5); // Wait a few microseconds SMBUS_IIC_SDA=0; // Clear SDA line delay_us(5); // Wait a few microseconds SMBUS_IIC_SCL=1; // Set SCL line delay_us(5); // Stop condition setup time(Tsu:sto=4.0us min) SMBUS_IIC_SDA=1; // Set SDA line } /******************************************************************************* * Function Name : SMBus_SendByte * Description : Send a byte on SMBus * Input : Tx_buffer * Output : None * Return : None *******************************************************************************/ uint8_t SMBus_SendByte(uint8_t Tx_buffer) { uint8_t Bit_counter; uint8_t Ack_bit; uint8_t bit_out; for(Bit_counter=8; Bit_counter; Bit_counter--) { if (Tx_buffer&0x80) { bit_out=1; // If the current bit of Tx_buffer is 1 set bit_out } else { bit_out=0; // else clear bit_out } SMBus_SendBit(bit_out); // Send the current bit on SDA Tx_buffer<<=1; // Get next bit for checking } Ack_bit=SMBus_ReceiveBit(); // Get acknowledgment bit return Ack_bit; } /******************************************************************************* * Function Name : SMBus_SendBit * Description : Send a bit on SMBus 82.5kHz * Input : bit_out * Output : None * Return : None *******************************************************************************/ void SMBus_SendBit(uint8_t bit_out) { if(bit_out==0) { SMBUS_IIC_SDA=0; } else { SMBUS_IIC_SDA=1; } delay_us(2); // Tsu:dat = 250ns minimum SMBUS_IIC_SCL=1; // Set SCL line delay_us(6); // High Level of Clock Pulse SMBUS_IIC_SCL=0; // Clear SCL line delay_us(3); // Low Level of Clock Pulse // SMBUS_IIC_SDA=1; // Master release SDA line , return; } /******************************************************************************* * Function Name : SMBus_ReceiveBit * Description : Receive a bit on SMBus * Input : None * Output : None * Return : Ack_bit *******************************************************************************/ uint8_t SMBus_ReceiveBit(void) { uint8_t Ack_bit; SMBUS_IIC_SDA=1; //引脚靠外部电阻上拉，当作输入 delay_us(2); // High Level of Clock Pulse SMBUS_IIC_SCL=1; // Set SCL line delay_us(5); // High Level of Clock Pulse if (SMBUS_SDA_PIN()) { Ack_bit=1; } else { Ack_bit=0; } SMBUS_IIC_SCL=0; // Clear SCL line delay_us(3); // Low Level of Clock Pulse return Ack_bit; } /******************************************************************************* * Function Name : SMBus_ReceiveByte * Description : Receive a byte on SMBus * Input : ack_nack * Output : None * Return : RX_buffer *******************************************************************************/ uint8_t SMBus_ReceiveByte(uint8_t ack_nack) { uint8_t RX_buffer; uint8_t Bit_Counter; for(Bit_Counter=8; Bit_Counter; Bit_Counter--) { if(SMBus_ReceiveBit()) // Get a bit from the SDA line { RX_buffer <<= 1; // If the bit is HIGH save 1 in RX_buffer RX_buffer |=0x01; } else { RX_buffer <<= 1; // If the bit is LOW save 0 in RX_buffer RX_buffer &=0xfe; } } SMBus_SendBit(ack_nack); // Sends acknowledgment bit return RX_buffer; } ///******************************************************************************* //* Function Name : delay_us //* Description : 延时 一次循环约1us //* Input : time //* Output : None //* Return : None //*******************************************************************************/ //void delay_us(u16 time) //{ // uint16_t i, j; // for (i=0; i<4; i++) // { // for (j=0; j<time; j++); // } //} /******************************************************************************* * Function Name : SMBus_Init * Description : SMBus初始化 * Input : None * Output : None * Return : None *******************************************************************************/ void SMBus_Init() { SMBUS_IIC_SCL=1; SMBUS_IIC_SDA=1; } /******************************************************************************* * Function Name : SMBus_ReadMemory * Description : READ DATA FROM RAM/EEPROM * Input : slaveAddress, command * Output : None * Return : Data *******************************************************************************/ uint16_t SMBus_ReadMemory(uint8_t slaveAddress, uint8_t command) { uint16_t data; // Data storage (DataH:DataL) uint8_t Pec; // PEC byte storage uint8_t DataL=0; // Low data byte storage uint8_t DataH=0; // High data byte storage uint8_t arr[6]; // Buffer for the sent bytes uint8_t PecReg; // Calculated PEC byte storage uint8_t ErrorCounter; // Defines the number of the attempts for communication with MLX90614 ErrorCounter=0x00; // Initialising of ErrorCounter slaveAddress <<= 1; //2-7位表示从机地址 do { repeat: SMBus_StopBit(); //If slave send NACK stop comunication --ErrorCounter; //Pre-decrement ErrorCounter if(!ErrorCounter) //ErrorCounter=0? { break; //Yes,go out from do-while{} } SMBus_StartBit(); //Start condition if(SMBus_SendByte(slaveAddress))//Send SlaveAddress 最低位Wr=0表示接下来写命令 {